as for the plastic ball socket thingies on some dahons..... I don't like them. Magnets are much nicer
and if the magnets are too weak get some tern magnets they are at least double as strong ...
Handlebar.... adjust the handlestem a little offset, so the upper handlepost leans against the inner channel, when closing push one side forward and close quick release ... there is enough play in the groove to make the handlebar slightly crocked if it floats around while closing
powerstraps with mks pedals ... great improvement in many ways
shifter... easy enough to change around ... keep in mind that u might need equal length grips as well